Mobile phone cover comprising two or more charging stations for rechargeable instruments

ABSTRACT

A mobile phone cover is provided comprising: a holder  120, 1120, 2120, 3120  for receiving and retaining a mobile phone  108 , the mobile phone comprising an energy supply; a portable charging device  106, 1106, 2106, 3106  having two or more charging stations  110, 1110, 2110, 3110 , each charging station  110, 1110, 2110, 3110  being configured and arranged for receiving and retaining a rechargeable instrument  104 , the rechargeable instrument  104  comprising an energy storage; the portable charging device  106, 1106, 2106, 3106  being further configured and arranged: to transfer energy, in use, from the energy supply of the mobile phone  108 , placed in the holder, to the two or more charging stations  110, 1110, 2110, 3110 ; and to transfer energy, in use, from the charging stations  110, 1110, 2110, 3110  to the energy storage of the rechargeable instrument  104  placed in the respective charging station  110, 1110, 2110, 3110.    
     By providing a portable charging device in a mobile phone case, there is a reduced risk that an instrument will not work properly or be inoperable. There may also be lower chance that the user will forget to take the rechargeable instruments when they are travelling and/or away from home.

TECHNICAL FIELD

This disclosure relates to a mobile phone cover comprising a mobilephone holder and two or more charging stations for receiving andretaining rechargeable instruments. It further relates to a medicalsystem comprising N implantable medical devices (IMD), a mobile phonecover, and M rechargeable instruments, wherein M≥N≥2, a rechargeableinstrument being configured for powering wirelessly an implantablemedical device (IMD).

BACKGROUND ART

Neurostimulation systems comprising implantable neurostimulation leadsare used to treat chronic pain. Conventional implantable spinal cordstimulation leads are designed for placement in the spinal canal as partof a spinal cord stimulation system, and for the therapeutic purpose oftreating various forms of chronic back and extremity pain.

A neurostimulation system for the purpose of treating chronic headachesis known from WO2017/120357A1. The system includes N implantable pulsegenerators (IPGs) from which multiple stimulating leads may extendsufficiently to allow for adequate stimulation over multiple regions ofthe head and an external charge transfer system. One external chargetransfer system (ECTS) is configured to charge and to communicate withthe N IPGs via N series-connected charge transfer coils. Each of thereceive coils of an IPG is tuned to the resonant frequency of therespective charge transfer coil. By sending forward telemetry commandsinstructing a selected IPG to communicate back telemetry data to theECTS, the non-selected IPG will forego attempted back telemetry duringsuch times.

By using an external charge transfer system outside a dermis layer, thedegree of access to the controller is greatly increased, and in somecases, the functionality that needs to be implanted may be reduced insome cases. However, the system may only be operated optimally if theexternal charge transfer system is correctly configured and fullyoperational. In addition, when using external units, it may not bepossible to operate an implant correctly if the external unit is notpresent or it is malfunctioning. In some cases, it may not be possibleto operate an implant at all with a missing or defective external unit.

SUMMARY OF INVENTION

It is an objective of the present technology to provide a portablecharging device for rechargeable instruments that increases the chancethat operable instruments will be available to a user.

In many applications where rechargeable instruments are used, commonproblems including the user forgetting to recharge the instrumentsand/or the user having too little time to fully recharge theinstruments. Especially where the rechargeable instruments are used fora personalized application, such as a personalised therapeutic,stimulation or medical use, users become more reliant and dependent onthe correct operation of these instruments, resulting in a severeinconvenience if they are not sufficiently charged. These issues areparticularly prominent when the battery lifetime of the rechargeableinstruments is less than a day, and require intermediate charging.Carrying specific charging means daily is a burden and may not beconsequently done by the user, leading to major discomfort when theinstruments run out of power.

By providing a portable charging device in a mobile phone case, there isa reduced risk that an instrument will not work properly or beinoperable. There may also be lower chance that the user will forget totake the rechargeable instruments when they are travelling and/or awayfrom home.

Preferred dimensions for the mobile phone cover are those suitable fortransport in a small bag, and most preferably pocket-sized.

Smaller dimensions should preferably be used, as this may increaseportability and may increase the likelihood that the user will use thecover regularly, preferably every day.

The mobile phone cover described herein is highlyconfigurable—differently dimensioned covers may be provided for one ormore specific type of phone, or a more universal mobile phone cover maybe provided to receive and retain a wide range of mobile phones.

In a further aspect, the mobile phone cover may be modified to provideinconspicuous and unobtrusive storage and charging. In particular, whenthe rechargeable instruments are configured for one or more therapeutic,stimulation and/or medical uses, the user may not wish others to beaware that they have a condition which requires treatment.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other aspects, properties and advantages will be explainedhereinafter based on the following description with reference to thedrawings, wherein like reference numerals denote like or comparableparts, and in which:

FIG. 1 shows schematically the components of a neurostimulation system;

FIG. 2 shows a block diagram of the EPTD;

FIG. 3 shows a block diagram of the IMD;

FIG. 4 shows a block diagram of a charging circuit;

FIG. 5 and FIG. 6 show examples of nerves that may be stimulated using asuitably configured neurostimulation system;

FIG. 7 shows further examples of nerves that may be stimulated using asuitably configured neurostimulation system;

FIG. 8 schematically depicts a charging system;

FIG. 9, FIG. 10 and FIG. 11 schematically depict further chargingcircuits comprised in a charging device;

FIG. 12 depicts schematically a mobile phone cover with discreet storageof one or more rechargeable instruments; and

FIG. 13 depicts schematically a further mobile phone cover with discreetstorage of one or more rechargeable instruments.

FIG. 14 depicts a portion of a further embodiment of a mobile phonecover schematically after the mobile phone has been placed in a holder

DETAILED DESCRIPTION OF INVENTION

FIG. 1 shows schematically the components of a neurostimulation systemaccording to the present subject technology and FIG. 8 schematicallydepicts an example of a charging system comprised in a mobile devicecover. The neurostimulation system is designed for the treatment ofchronic headaches. It incorporates multiple elements and features thatconsider the unique anatomic, physiologic, and other related challengesof treating pain with implantable neurostimulation, thereby greatlyimproving on therapeutic response, patient safety, medical risk, andmedical costs, thereby providing an improved overall patientsatisfaction.

The neurostimulation system comprises four different components: animplantable medical device (IMD) 102, a rechargeable instrument 104,such as an external power transfer device (EPTD) 104, a charging device106, and a mobile phone 108. FIG. 1 shows two IMDs 102; an OccipitalNerve Stimulation (ONS) implant and a Supra-Orbital Nerve Stimulation(SONS) implant. The ONS implant is implanted underneath the skin of theback of the head. The ONS implant stimulates the peripheral nerves usingmild electrical pulses. This treatment is used to lower the intensityand frequency of headache attacks. The SONS implant is placed underneaththe skin of the forehead and during stimulation an electrical current isapplied to the supraorbital nerves, a branch of the frontal nerve.

The EPTD 104 powers wirelessly the IMD 102 and it may be mechanicallycoupled to the IMD by means of magnetic forces. In an embodiment, theIMD comprises an internal magnet and the EPTD comprises an externalmagnet. In the context of the present description the term “internal”means in the head underneath the skin and the term “external” means outof the head. In another embodiment, one of the IMD and EPTD comprises amagnet and the other comprises a ferromagnetic material. In anembodiment the EPTD functions also as external pulse generator forsupplying via the IMD electrical current to the nerves.

The charging device 106 is configured to charge an energy storage, suchas one or more rechargeable batteries, comprised in the rechargeableinstrument 104, such as in an EPTD. The charging device 106 is furtherconfigured and arranged to be portable—in other words, it can becarried. Optionally, the charging device 106 may be further configuredand arranged to exchange data with the rechargeable instrument 104. Thecharging device 106 comprises two or more charging stations 110, eachconfigured and arranged for receiving and retaining a rechargeableinstrument 104—in this example, an EPTD 104. n the embodiment shown inFIG. 1, the charging device 106 comprises four charging stations 110. Inthe schematic depiction of FIG. 8, two charging stations 110 are shown.

The fourth component of the system is a mobile device 108. The mobiledevice 108 provides a user interface to monitor and set the parametersof the EPTD and IMD and to review the applied therapy. In FIG. 1 themobile device 108 is a mobile phone. However, the mobile device can beany device providing a user interface and display enabling a user tocontrol and monitor operating parameters of the EPTD and IMD, such as atablet computer. Additionally or alternatively, the mobile device mayprovide a user interface and display enabling a user to control andmonitor charging parameters of the EPTD and IMD.

Although the phrase “mobile phone” is used, this should be understoodalso comprising devices which provide a limited (or even no) traditionaltelephone functionality, such as voice calling, but provide one or meansof communicating, such as with messaging apps. In general, “mobilephone” should be interpreted as a portable personal communicationsdevice.

In FIG. 1 and FIG. 8, the charging device 106 is comprised in a mobiledevice cover, more specifically a mobile phone cover. The mobile phonecover comprises a holder 120 for receiving and retaining the mobilephone 108.

A mobile phone cover may be made using one or more suitable materials,such as a fabric, a natural material, a plastic and/or a polymer. In thecontext of this disclosure, a cover for a mobile phone is typicallyconfigured and arranged to protect and/or conceal a portion of theexternal surface (or face) of the mobile phone 108, such as the screenside or the back. Mobile phone covers are also known which protectand/or conceal portions of more than one external surface (or face)—forexample, a cover may conceal and/or protect both the screen and theback, as well as one or more sides.

Cases for a mobile phone are also known—traditionally a case isunderstood to enclose the mobile phone, but some covers also enclose themobile phone. So, in the context of this disclosure case and covershould be considered as synonymous.

The holder 120 is configured and arranged to receive and retain themobile phone 108. For example, using one or more magnets, one or moremechanical retainers, one or more protrusions, one or more recesses, oneor more fasteners, one or more openings, one or more resilient elements,one or more elastic elements, one or more clamps, one or more hooks, oneor more threaded elements, one or more pins, one or more adhesiveelements, one or more coatings, and any combination thereof to retainthe mobile phone 108.

Optionally, the mobile phone cover may be configured and arranged toreceive and retail the holder 120, or the holder 120 may be rigidlyattached to the mobile phone cover. Holder 120 should be interpreted asone or more elements cooperating to allow the mobile phone 108 to bereceived and retained in the mobile phone cover. The holder 120 may beconfigured and arranged to accept a wide range of mobile phones 108, orone or more specific types of mobile phone 108.

Each charging station 110 is configured and arranged to receive andretain a rechargeable instrument 104. For example, using one or moremagnets, one or more mechanical retainers, one or more protrusions, oneor more recesses, one or more fasteners, one or more openings, one ormore resilient elements, one or more elastic elements, one or moreclamps, one or more hooks, one or more threaded elements, one or morepins, one or more adhesive elements, one or more coatings, and anycombination thereof to retain the rechargeable instrument 104.

In FIG. 1, each charging station 110 comprises a recess, configured toreceive the rechargeable instrument 104. One or more magnets ormechanical retainers may be used, for example, to retain therechargeable instrument 104. I Each charging station 110 is configuredand arranged to allow the rechargeable instrument 104 to be removed,either directly by hand, or using a simple tool, a mechanically operatedrelease and/or an electrically operated release. Preferably, eachrechargeable instrument 104 can be removed manually—for example, an EPTDcan be manually removed from a charging station by tilting and grabbingthe EPTD, or by tilting the EPTD and gliding it out of a magnetic slotof the charging station 110.

In FIG. 1 and FIG. 8, the mobile phone 108 comprises an energy supply,and the portable charging device 106 is configured and arranged:

-   -   to transfer energy, in use, from the energy supply of the mobile        phone 108, placed in the holder 120, to the two or more charging        stations 110; and    -   to transfer energy, in use, from the charging stations 110 to        the energy storage of the rechargeable instrument 104 placed in        the respective charging station 110.

The energy supply of the mobile phone 108 may comprise, for example, oneor more rechargeable batteries.

By suitable configuration of the mobile phone cover and/or the portablecharging device 106, different types of rechargeable instruments 104 maybe accommodated. For example, one or more rechargeable instruments 104may be an implantable device, an implantable neurostimulation device, anEPTD 104, a wearable device, a medical device, an implantable medicaldevice (IMD) 102, a therapeutic device, a medical aid, a cosmeticdevice, a device for stimulating one or more nerves (neurostimulator), adevice for stimulating one or more muscles, a device for stimulating oneor more organs, a device for stimulating spinal cord tissue, a deviceconfigured for powering wirelessly a further device, a device configuredfor powering wirelessly a further rechargeable instrument 104, apersonalized device, a custom-made device, a patient-specific device, adevice for an individual, or any combination thereof. The rechargeableinstrument 104 should not be construed as including one or more mobilephones 108.

Covers and cases are known for receiving a one or more bank/creditcards—however, such a card, even smartcards, should not be considered asa rechargeable instrument 104 in the context of this disclosure.

Although smartcards may have a degree of energy storage, used bysmartcard readers to read data from the card, they do not operate asintended once they leave the region in which energy is being received.In the context of this disclosure, a rechargeable instrument 104 isconfigured and arranged to retain an amount of energy in its energystorage such that the instrument 104 can substantially operate asintended for a significant period of time when it is no longer receivingenergy from the storage device 106.

In an alternative embodiment, the functionality of charging device 106and mobile device 108 is combined in one apparatus. Furthermore, thecharging device 106 may receive its energy from another source than themobile device 108—for example, the charging device 106 may furthercomprise a charging energy storage, such as one or more rechargeablebatteries. The charging device 106 may optionally be configured andarranged:

-   -   to transfer, in use, energy from the energy supply of the mobile        phone 108, placed in the holder, to the charging energy storage;        and    -   to transfer, in use, energy from the charging energy to the two        or more charging stations 110.

In an alternative embodiment of the charging device, a charging station106 is configured to receive and charge more than one rechargeableinstrument 104, such as more than one EPTD 104. In this embodiment, theEPTDs in the charging station are charged simultaneously.

FIGS. 5 and 6 depict examples of nerves that may be stimulated using asuitably configured neurostimulation system 100 with an implantabledistal end. It may provide neurostimulation to treat, for example,headaches or primary headaches.

FIG. 5 depicts the left supraorbital nerve 910 and right supraorbitalnerve 920 which may be electrically stimulated using a suitablyconfigured device. FIG. 6 depicts the left greater occipital nerve 930and right greater occipital nerve 940 which may also be electricallystimulated using a suitably configured neurostimulation system 100.

Depending on the size of the region to be stimulated and the dimensionsof the part of the device to be implanted, a suitable location isdetermined to provide the electrical stimulation required for thetreatment. Approximate implant locations for the distal part of thestimulation device comprising stimulation devices 100 are depicted asregions:

-   -   location 810 for left supraorbital stimulation and location 820        for right supraorbital stimulation for treating chronic headache        such as migraine and cluster.    -   location 830 for left occipital stimulation and location 840 for        right occipital stimulation for treating chronic headache such        as migraine, cluster, and occipital neuralgia.

In many cases, these will be the approximate locations 810, 820, 830,840 for the implantable part of the neuro stimulation system 100.

For each implant location, 810, 820, 830, 840 a separate combinations ofEPTD and IMD may be used. Where implant locations 810, 820, 830, 840 areclose together, or even overlapping, a single stimulation system may beconfigured to stimulate at more than one implant location 810, 820, 830,840. A plurality of stimulation devices 100 may be operated separately,simultaneously, sequentially or any combination thereof to provide therequired treatment.

FIG. 7 depicts further examples of nerves that may be stimulated using asuitably configured stimulation system 100 to provide neurostimulationto treat other conditions. The locations depicted in FIG. 5 and FIG. 6(810, 820, 830, 840) are also depicted in FIG. 7.

Depending on the size of the region to be stimulated and the dimensionsof the part of the device to be implanted, a suitable location isdetermined to provide the electrical stimulation required for thetreatment. Approximate implant locations for the part of the stimulationdevice comprising stimulation electrodes are depicted as regions:

-   -   location 810, 820 for cortical stimulation for treating        epilepsy;    -   location 850 for deep brain stimulation for tremor control        treatment in Parkinson's disease patients; treating dystonia,        obesity, essential tremor, depression, epilepsy, obsessive        compulsive disorder, Alzheimer's, anxiety, bulimia, tinnitus,        traumatic brain injury, Tourette's, sleep disorders, autism,        bipolar; and stroke recovery    -   location 860 for vagus nerve stimulation for treating epilepsy,        depression, anxiety, bulimia, obesity, tinnitus, obsessive        compulsive disorder, heart failure, Crohn's disease and        rheumatoid arthritis;    -   location 860 for carotid artery or carotid sinus stimulation for        treating hypertension;    -   location 860 for hypoglossal & phrenic nerve stimulation for        treating sleep apnea;    -   location 865 for cerebral spinal cord stimulation for treating        chronic neck pain;    -   location 870 for peripheral nerve stimulation for treating limb        pain, migraines, extremity pain;    -   location 875 for spinal cord stimulation for treating chronic        lower back pain, angina, asthma, pain in general;    -   location 880 for gastric stimulation for treatment of obesity,        bulimia, interstitial cystitis;    -   location 885 for sacral & pudendal nerve stimulation for        treatment of interstitial cystitis;    -   location 885 for sacral nerve stimulation for treatment of        urinary incontinence, fecal incontinence;    -   location 890 for sacral neuromodulation for bladder control        treatment; and    -   location 895 for fibular nerve stimulation for treating gait or        footdrop.

Other conditions that may be treated include gastro-esophageal refluxdisease, an autoimmune disorder, inflammatory bowel disease andinflammatory diseases.

IMD's 102 may be optimised for the stimulation of one or more nerves,one or more muscles, one or more organs, spinal cord tissue, braintissue, one or more cortical surface regions, one or more sulci, and anycombination thereof.

FIG. 2 shows a block diagram of an embodiment of an EPTD according tothe present technology. The EPTD comprises an application specific IC(ASIC) 200, a rechargeable battery and a transmission/receiving coil L2with or without a series-resonant capacitor. The ASIC comprises chargerpart 202, a Wireless Communication Module (WCM) part 204, a Logiccontrol part 206 and a power amplifier (PA) part 208. The charger part202 comprises commonly known circuitry such as a rectifier, anup-converter, charger circuitry having constant current (CC) andconstant voltage (CV) mode, battery monitoring and load control. Therechargeable battery can be any type of suitable rechargeable battery.The WCM part 204 comprises commonly known circuitry for WirelessCommunication via the coil L2, such as a demodulator, modulator and aload-shift keying (LSK) signal generator. The WCM part 204 enables theEPTD 104 to communicate with the IMD 102 and the charging device 106.The WCM part can be configured to apply any of the NFC standards, Qiinterface standard or any other suitable proprietary wirelesscommunication and energy transfer protocol. The Logic control part 206comprises a pulse generator, control logic for controlling functions ofthe EPTD and a memory in which a number of IMD parameter sets arestored. An IMD parameter set comprises all control parameters an IMDneeds to work properly and to apply a therapy. According to the presenttechnology, each IMD parameter set comprises a unique identificationcode having a value linked to the unique identification code of an IMD102. In this way, the EPTD 104 knows which IMD parameter set has to beused for which IMD. The ASIC further comprises a power amplifier PAblock comprising an amplifier and a matching circuit. A selector is usedto switch between charging mode and IMD powering mode. In charging mode,the internal battery of the EPTD is charged. In IMD powering mode, poweris transmitted to an IMD. In both modes, data transfer is possible. TheEPTD is configured to send, preferably at regular intervals, a powersignal to the IMD. The energy transferred in a power signal should besufficient to enable the IMD to generate a stimulation pulse and topower the electronic circuitry of the IMD up to at least the next powersignal. In an embodiment the power signal is a pulse-like signal. TheEPTD can be configured to send a continuous power signal to the IMD.However, this has the disadvantage that unnecessary power is consumed bythe IMD in the human body, which can cause heating of the tissue aroundthe IMD.

FIG. 3 shows an example of block diagram of the IMD according to thepresent technology. This block diagram is not specific for theinvention, other block diagrams can be devised. The IMD comprises anASIC 300, a transmission/receiving coil L1 and one or more Electrodes(not shown). The ASIC 300 comprises an Overvoltage protection circuitry,tuning circuitry, a supply part 302, a high voltage (HV) part 304, alogic control part 306 and an NFC part 308.

The supply part 302 comprises a rectifier, a HV buffer in the form of acapacitor, voltage measuring unit measuring the voltage of the HV bufferand controlling a Low-DropOut regulator and a low voltage buffer in theform of another capacitor. The Low-DropOut regulator supplies energy tothe low voltage buffer. The capacity of the low voltage buffer issufficient to power the logic control part 306 and NFC part 308 to atleast the next power signal. The high voltage part 304 is configured tosupply a stimulation pulse to the electrodes of the IMD. To perform thisfunction, the high voltage part 304 comprises a current source, acurrent measuring unit and an electrode switch. The measured current issupplied to the logic control part 306. The electrode switch iscontrolled by a switch control signal generated by the logic controlunit 306. The electrode switch enables to limit the amount of current ofthe stimulation pulse supplied to the electrodes.

The logic control part 306 comprises a memory to store the IMD parameterset, a unique identification code permanently stored in a memorylocation, a clock generator for generating a clock signal for the logiccontrol unit, a counter for counting the number of clock cycles, aswitch control signal generator a feedback circuit and a controller. Theclock generator derives a clock signal from the RF frequency. As aresult the clock signal of the EPTD and IMD will have the same clockfrequency. The feedback circuit measures the current to the electrode(s)and determines a feedback signal to the EPTD to enable to EPTD tocontrol the level of the power signal generated by the EPTD. In anembodiment to reduce the dimensions of the ASIC the memory to store theIMD parameter set is a volatile memory, along with a compactnon-volatile memory to store the IMD identification code (e.g. usingfuses). In another embodiment, at least a part of the IMD parameter setis stored in non-volatile memory.

The WCM part 308 comprises commonly known circuitry for WirelessCommunication via the coil L1, such as a demodulator, modulator and aload-shift keying (LSK) signal generator. The WCM part 308 enables theIMD to communicate with the EPTD.

In general, the portable charging device further comprises a chargingcircuit, the charging circuit comprising one or more electricalcomponents, configured and arranged to control charging in use.Optionally, one or more of these components may comprise one or morecoils, configured and arranged to transmit and/or receive energywirelessly.

FIG. 4 shows a block diagram of a first embodiment of a charging circuit400, comprised in the portable charging device 106. FIG. 8 schematicallydepicts the main interfaces of the charging circuit 400 with the othercomponents of the portable charging device 106.

The charging circuit 400 comprises a coil, connected to an input powerpart 402, to wirelessly receive power from a mobile phone 108 by meansof a suitable energy transfer protocol. For example, Qi, Powermat,Rezence, WiPower, Open Dots, PMA, Wireless Power Transfer (WPT),Simultaneous Wireless Information and Power Transfer (SWIPT), inductivecoupling, resonant inductive coupling, capacitive coupling, and anycombination thereof. The mobile device 108 comprises a correspondingcoil 125, configured and arranged to transfer energy to the input powerpart 402.

Configuring and arranging one or more coils to transmit and/or receiveenergy wirelessly may require optimising one or more mechanical,electrical and/or magnetic parameters relevant for energy transfer. Forexample:

-   -   current, voltage, energy charge and/or power supplied to the        transmission coil;    -   frequency, waveform shape, repetition rate, operation duration        of the transmission energy;    -   relative proximity, alignment and/or orientations of the        transmitting and receiving coils;    -   relative dimensions of the transmitting and receiving coils;    -   the number of turns, the conductor materials used, the conductor        thickness;    -   materials comprised in the cover, and in particular, in the        charging station to increase energy transfer.

Optionally, the coil may be further configured and arranged to exchangedata with the mobile phone 108 by means of a suitable wirelesscommunication protocol, or a further coil may be so configured. Forexample, Bluetooth, Bluetooth LE, NFC, Low-power WAN, LTE, Qi, Wi-Fi,and any combination thereof. The coil 125 may be further configured andarranged to exchange data with the coil of the input power part 402, ora further coil may be so configured.

Some protocols may allow both energy transfer and wireless communicationto a suitable degree.

The charging circuit 400 further comprises the input power part 402, andat least one charging station 110. If optionally data is to be shared,the charging circuit 400 further comprises a WCM part 404.

The charging circuit 400 associated with a charging station 100comprises a charger part 408, 418, and a coil 412, 422 configured andarranged for energy transfer. If optionally data is to be shared, thecharging station part of the circuit 400 further comprises a WCM part410, 420 and either a suitably configured coil 412, 422 or a furthercoil optimised for data communication.

A charging station 110 is configured to wirelessly transfer energy tothe energy storage of the rechargeable instrument 104 placed in therespective charging station, for example to charge the rechargeablebattery of an EPTD placed in the charging station. Optionally, data maybe exchanged with the EPTD by means of the WCM part 404. The WCM part404 of the charging circuit 400 comprises commonly known circuitry of ademodulator, a modulator and a load-shift keying (LSK) signal generator.

The rechargeable element 104 further comprises a corresponding coil 115,configured and arranged to receive energy from the energy transfer coils412, 422 of the charging circuit 400.

In summary, the portable charging device 106 is configured and arranged:

-   -   to wirelessly transfer energy, in use, from the energy supply of        the mobile phone 108, placed in the holder, to the charging        circuit 400;    -   to transfer energy through the charging circuit 400 (wired), in        a predetermined and/or controlled manner, to two or more        charging stations 110; and    -   to wirelessly transfer energy, in use, from the charging        stations 110 to the energy storage of the rechargeable        instrument 104 placed in the respective charging station 110.

Optionally, the portable charging device 106 may be further configuredand arranged, in use:

-   -   to transfer data from the mobile phone 108 to one or more        rechargeable instrument 104;    -   to receive data by the one or more rechargeable instrument 104        from the mobile phone 108;    -   to transfer data from one or more rechargeable instrument 104 to        the mobile phone 108;    -   to receive data by the mobile phone 108 from the one or more        rechargeable instrument 104;    -   to transfer data from a first rechargeable instrument 104 to a        further rechargeable instrument 104;    -   to receive data by a further rechargeable instrument 104 from        the one or more rechargeable instrument 104);    -   and any combination thereof.

Optionally, the charging device 106 and the charging circuit 400, may beconfigured and arranged to allow a degree of energy transfer betweenrechargeable instruments 104.

For example, if one or more rechargeable instruments 104 comprise afurther energy supply, the portable charging device 106 may be furtherconfigured and arranged:

-   -   to wirelessly transfer energy, in use, from the further energy        supply of the one or more rechargeable instruments 104 placed in        a first charging station 110 to the charging circuit 400;    -   to transfer energy through the charging circuit 400 (wired), in        a predetermined and/or controlled manner, to one or more further        charging stations 110; and    -   to wirelessly transfer energy, in use, from the one or more        further charging stations 110 to the energy storage of the        rechargeable instrument 104 placed in the respective further        charging station 110.

Where required, the charging device 400 may be configured and arrangedto control the charging in a predetermined and/or controlled manner.

According to an embodiment of the present technology, the IMD parameterset of an IMD is stored in volatile memory. As a result, the content ofthe IMD parameter set in the IMD is lost as soon as the low voltagebuffer of the IMD is out of charge. The IMD is powered wirelessly by theEPTD. The EPTD generates at regular intervals a power signal to powerthe IMD. Depending on the implementation, during and/or after thegeneration of a power signal, the IMD and EPTD can exchange data. Sowhen an EPTD is disconnected from an IMD, the IMD will be out of powervery quickly as it does not receive power signals anymore. Consequentlythe IMD will lose any data stored in volatile memory and thus the IMDparameter set which is necessary to apply the correct treatment. Toensure that the treatment of headaches is not interrupted too long, theuser must have at least two EPTDs. This allows the user to have alwaysan EPTD with a fully charged rechargeable battery available forreplacing an EPTD with an empty rechargeable battery. However if theuser has two IMD for treatment of chronic headache, the EPTD could becombined with any of the two IMDs. However each IMD could have its ownIMD parameter set defining the treatment to be applied. So to enable anEPTD to supply an IMD parameter set to any the EPTD in the medicalsystem, the EPTD must have the IMD parameter set of at least all IMDsused in the system. Furthermore, the EPTD should not send to an IMD aparameter set that has to be used by another IMD. To ensure this, eachIMD has its own unique IMD identification code permanently stored in anaddressable location. Furthermore, in the EPTD, the IMD parameter setcomprises an associated unique identification code. The uniqueidentification code can be integral part of the IMD parameter set. Itmight also be possible that the EPTD stores in its memory a linkagebetween an IMD parameter set and a unique IMD identification code.

When an EPTD is magnetically coupled to an IMD, the EPTD will transmit apower signal to the IMD. The power signal will awake the IMD. After theIMD is activated, the IMD will be in not-connected mode. Innot-connected mode, the IMD will transmit its unique identification codeto the EPTD after the IMD is sufficiently powered by the power signal.The EPTD will receive the unique identification code and subsequentlysearch in its memory for an IMD parameter set having an associatedunique identification code which matches the unique identification codereceived from the IMD. If there is a matching identification code, theEPTD will transmit the associated IMD parameter set to the IMD togetherwith the associated unique identification code. The IMD verifies whetherthe associated unique identification code corresponds to its own uniqueidentification code. If there is a match, the IMD will switch toconnected mode. If there is not a match, the IMD stays in non-connectedmode. As a result, the IMD will retransmit to the EPTD its uniqueidentification code after the receiving a subsequent power signal. Inconnected mode, the IMD could regularly transmit its current parameterset to EPTD. In this way, also adjustment of the IMD parameter set bythe IMD is regularly updated in the corresponding IMD parameter setstored in the memory of the EPTD. In this way, the EPTD stores an actualIMD parameter set in its memory.

In the portable charging device 106, the following method is applied.When an EPTD is positioned in a charging station 110 of the chargingdevice 106, the charging device 106 will request to transmit at leastthe IMD parameter set that has been transmitted to an IMD after the lastrecharging action of said IMD. This IMD parameter set may have parametervalues that have been modified by the IMD during the period that theEPTD had powered the IMD. In an embodiment, the IMD parameter setcomprises a time stamp indicating the time when the latest modificationwas made or the time when the EPTD most recently received the IMDparameter set from the IMD.

Optionally, the portable charging device 106 may further comprise one ormore memory components, configured and arranged to store and/ordistribute one or more parameter sets of data. Optionally, one or morememory components may be comprised in the charging circuit 400.

After receipt of an IMD parameter set from the EPTD, the charging device106 may update the IMD parameter set in its own parameter set memory.The updating may depend on the time stamp of the IMD parameter set. Inan embodiment, an IMD parameter set is only replaced by a new IMDparameter set when the time stamp of the new parameter set from the IMDis later in time than the time stamp of the parameter set currentlystored in a parameter set memory of the charging device 106. It shouldbe noted that each parameter set stored in the parameter set memory ofthe charging device has a corresponding unique IMD identification code.

After the charging device 106 has received a new IMD parameter set, thecharging device 106 distributes the parameter set to all EPTDs that are(or will be) located in the other charging stations. In this way, allEPTDs will have the same IMD parameter sets stored in its memory. In analternative embodiment, the charging device 106 distributes allparameter sets stored in its parameter set memory to all EPTDs locatedin the charging stations 110. In this alternative embodiment, all EPTDslocated in the charging device 106 will have the same IMD parameter setsfor all IMD used in the medical system. Thus when an EPTD is placed in acharging station 110 of the charging device 106, the charging device 106first obtains at least the IMD parameter sets from the EPTD whichcontent has been changed after its last removal from the charging device106. Subsequently, the charging device 106 transmits all the IMDparameter sets stored in its parameter set memory to the last placedEPTD in the charging stations 110 to update the IMD parameter sets inthe EPTD. Furthermore, the charging device 106 transmits at least theIMD parameter sets that have been updated after obtaining the IMDparameters from the EPTD after placement in a charging station 110 tothe EPTDs located in the other charging stations. Thus it might bepossible that when an EPTD that has not been used for a long time isplaced in the charging device 106, the changed IMD parameters sets thatare submitted to the charging device 106 are not used to update thecorresponding IMD parameter sets stored in the parameter set memory ofthe charging device 106. This is due to the fact that the time stampsassociated with the IMD parameters sets from the EPTD indicate a momentin time which is before the moment in time indicated by the time stampsassociated with corresponding IMD parameter sets having the same uniqueidentification code and stored in the parameter set memory of thecharging device 106. Consequently, the charging device 106 will onlyupdate the IMD parameter sets in the EPTD that has not been used for along time.

As described above, the EPTD generates a pulse shaped power signal. Inan embodiment, the IMD controls which part of the pulse shaped powersignal is passed to the electrodes of the IMD to form the stimulationpulse. So the EPTD determines when a stimulation pulse could be suppliedto the electrodes and the IMD controls the beginning and end of thestimulation pulse. In an alternative embodiment, the IMD comprises apulse generation module and pulse energy storage with a capacity that issufficient for the IMD to generate a burst of stimulation pulses with aduration sufficient to apply a therapy according to the IMD parameterset. To be sure that the EPTD and IMD uses the same IMD parameter setsto generate the stimulation pulse, the EPTD sends every now and then acommand to the IMD comprising a unique identification code associatedwith the IMD parameter set which the EPTD is using to generate the powersignals. If the unique IMD identification code in the commandtransferred from the EPTD to the IMD differs from the unique IMDidentification code of the IMD parameter set which the IMD currently isusing to form the stimulation signal, the IMD will detect this and itwill change to the status of the IMD from connected mode tonot-connected mode. In this way, the risk that incorrect stimulationpulses will be supplied to the electrodes is reduced significantly. Forthe same reason in an embodiment, the IMD is configured in connectedmode to transmit intermittently its unique IMD identification code tothe EPTD. The EPTD will check whether said unique IMD identificationcode matches with the IMD identification code of the IMD parameter setthat the EPTD uses to generate the power signals at regular intervals.In an embodiment, after detection of a mismatch, the EPTD stops with thegeneration of subsequent power signals for a predetermined time to forcethe IMD to run out of charge such that the IMD content of its memory iscleared and the IMD begins to transmit its IMD identification code tothe EPTD. After receipt of the IMD identification code by the EPTD, theEPTD will transmit the IMD parameter set associated with the same IMDparameter code to the IMD. As a result the EPTD and IMD use theparameter sets having the same IMD identification code.

As described before, the memory of the IMD can be a volatile memory.Furthermore, there might be periods in time wherein no stimulationpulses are supplied to the electrodes of the IMD and/or no communicationbetween the EPTD and IMD has to take place in the time period betweentwo power signals. For that case, the IMD has an ultra-low power mode.In ultra-low power mode of the IMD, only the clock generator generates aclock signal to keep the IMD alive to the next power signal. The energystorage in the capacitor to power the electronics is chosen such thatthe IMD stays alive up to at least the next power signal. In anembodiment, the period of time to stay alive in low power mode is adevice specific parameter permanently stored in the IMD. This parameteris submitted to the EPTD to define at the EPTD the period of timebetween two charging pulses. Furthermore, IMD could transmit a parameterto the EPTD which is indicative for the energy storage capacity of thecapacitor for powering the electronics of the IMD. This parameter isused to limit the energy of a power signal in case no stimulation pulsehas to be supplied to the electrode(s) of the IMD. In other words, theIMD is configured to operate at least in a first operating mode(ultra-low power) and a second operating mode (normal operation). TheEPTD is configured to determine the operating mode of the IMD, and togenerate power signals with a time interval between two power signalsdepending on the determined operating mode of the IMD. The IMD furthercomprises an energy storage with an energy storage capacity that enablesthe IMD to hold the data stored in the volatile memory for more than onetime interval and preferably not more than two time intervals, whereinthe time interval is defined by the operating mode determined by theEPTD and parameters related to the energy storage capacity and energyconsumption of the electronics of the IMD in the respective modes. Itshould be noted that said parameters can be stored in the IMD parameterset as each IMD comprises its own parameter set which is linked to theunique IMD identification code.

So, If the period of no communication/no stimulation lasts longer thanthe energy stored in the capacitor allows in ultra-low power mode, ashort power signal with low amplitude can be given to recharge thecapacitor instead of a power signal that is also suitable to supply astimulation pulse to the electrodes. The later power signal has a highamplitude for a longer time.

In another embodiment, the IMD is configured to communicate with theEPTD about the energy stored in the capacitor for powering theelectronics of the IMD and optionally the pulse energy storage forgenerating of the stimulation pulses internally by the IMD. Thisembodiment enables the IMD to control the characteristics of the powersignal generated by the EPTD, such as but not limited to: amplitude,pulse width and length of the power signal.

In an embodiment, the EPTD generates a continuous power signal. In thisembodiment, the IMD will transmit in not-connected mode at regularintervals it unique IMD identification code. After receiving an IMDparameter set including said unique IMD identification code, the IMDswitches to connected mode.

In an alternative embodiment, the EPTD transmits wirelessly all IMDparameter sets stored in its memory when the EPTD detects that an IMDreceives power from the EPTD. In this embodiment, the IMD receives allIMD parameter sets transmitted by the EPTD. The IMD retrieves from eachIMD parameter set the unique identification code included in said IMDparameter set. When the retrieved unique identification code matches itsown unique IMD identification code, the IMD deploys said parameter setto enable the IMD to provide the electrical stimulation defined by theIMD parameter set to the body where the IMD is implanted.

In an embodiment, the charging device 106 and/or comprises a userinterface to adapt the IMD parameter sets. If there is no user interfaceon the EPTD, the charging device 106 may also pass on adapted parametersets to the EPTD, and the charging device 106 may make adjustments basedon user feedback (e.g. a smartphone user interface where the patientindicates how effective a therapy has been) or based on usageinformation (how long did the user actually use the EPTD). The usageinformation can also be read by the charging device 106 from the EPTD).

In the embodiments described above, the IMD is a neuro stimulationdevice. The presented technology can also be used in implants for otherapplications that control electronically for example micro valves orpumps implanted in a body.

In many applications where rechargeable instruments 104 are used, commonproblems including the user forgetting to recharge the instruments 104and/or the user having too little time to fully recharge the instruments104.

Especially where the rechargeable instruments 104 are used for apersonalized application, such as a personalised therapy, stimulation ormedical use, users become more reliant and dependent on the correctoperation of these instruments, resulting in a severe inconvenience ifthey are not sufficiently charged. In this context, personalized meansthat the instruments 104 are optimised for a few users—in other words,in case of a defective personalized rechargeable instrument 104, theuser has very few possibilities to find a replacement. The personalizedrechargeable instruments 104 are unlikely to be available for immediateuse as mass-produced devices, commodity devices, or off-the-shelf items.

The degree of personalization is greatly increasing, which makes theinconvenience worse. In some cases, where the rechargeable instruments104 are custom-made, patient-specific or patient-adaptable, therechargeable instruments 104 should only be used by one user or anindividual—if used by others, the rechargeable instruments 104 may justoperate incorrectly. However, in some critical cases, the use by othersmay even pose a substantial health risk.

In systems where critical functionality is divided over two or moredevices, and one of these is a rechargeable instrument 104 for powering(either wired and/or wirelessly) a further device (for example, an EPTD104 and IMD 102), the degree of inconvenience is similar as these two ormore devices must be paired to a high degree. Dividing the functionalityover a plurality of devices may increase the chance that one of thesedevices is not operable or even forgotten as there are more devices tokeep track of. In addition, dividing the function may result in smallerdevices, which are even more likely to be lost.

Custom-made means that it is intended to address a specificanatomo-physiological features or pathological condition of theindividual (or user) for whom it is intended. Patient-specific meansthat it is produced based on a standard device template model, orspecified design envelope (e.g., minimum and maximum dimensions,performance limits, and other clinically relevant factors), that ismatched to a patient's anatomy using techniques such as scaling of thedevice based on anatomic references, or by using the full anatomicfeatures from patient imaging. Patient-adaptable means that it is amass-produced medical device that must be adapted or assembled at thepoint of care, in accordance with the manufacturer's instructions, tosuit an individual's specific anatomo-physiologic features prior to use.Mass-produced means identical devices that are produced in continuousproduction runs or homogenous batches.

By providing a portable charging device 106 in a mobile phone coverthere is a reduced risk that an instrument will not work properly whenthe user wishes to use it. In addition, there may also be lower chancethat the user will forget to take the rechargeable instruments with themwhen they are travelling and/or away from home. Most users will reliablycharge their phone 108, and are used to taking it with them when theyare travelling and/or away from home.

Additionally, many mobile phones 108 are dimensioned to be portable,particularly commercially available mobile phones 108.

Preferred dimensions for the mobile phone cover are those suitable fortransport in a small bag, and most preferably pocket-sized.

Smaller dimensions should preferably be used, as this may increaseportability and may increase the likelihood that the user will use thecover regularly, preferably every day.

FIG. 11 depicts schematically a further embodiment of a charging circuit3400 comprised in a further embodiment of a charging device 3106.

The charging device 3106 is the same as that depicted in FIG. 8, exceptfor:

-   -   the charging circuit 3400 does not comprise one or more coils to        receive energy from the mobile phone 108;    -   the charging circuit 3400 does not comprise one or more coils to        transfer energy to the two or more charging stations 3110; and    -   the charging circuit 3400 does not transfer charging energy        through itself (wired) from the mobile phone 108 to the two or        more charging stations 3110.

In other words, the portable charging device 3106 is configured andarranged:

-   -   to wirelessly transfer energy, in use, from the energy supply of        the mobile phone 108, placed in the holder, to the energy        storage of the rechargeable instruments 104 placed in the        charging stations 3110.

Where required, the charging device 3400 may be configured and arrangedto control the charging in a predetermined and/or controlled manner.

By suitable configuration and arrangement of the energy transfer coil3125 comprised in the mobile phone 108, the holder 3125 of the mobilephone 108, the two or more charging stations 3110, and the energyreception coils 3115 comprised in the one or more rechargeableinstruments 104, a charging circuit 3400 may be made optional.Additionally or alternatively, the control of the charging in apredetermined and/or controlled manner may be performed using a softwareapp, running on the mobile phone 108.

FIG. 10 depicts schematically another embodiment of a charging circuit2400 comprised in a further embodiment of a charging device 2106.

The charging device 2106 is the same as that depicted in FIG. 11, exceptfor:

-   -   the charging circuit 2400 comprises one or more electrical        interconnections and/or electrical connectors 1125, configured        and arranged to connect to the mobile phone 108 when placed in        the holder 2120, and further configured and arranged to transfer        energy wired from the energy supply of the mobile phone 108 to        the charging circuit 2400;    -   the charging circuit 2400 comprises a coil 2125 to transfer        energy wirelessly from the charging circuit 2400 to the two or        more charging stations 2110; and    -   the two or more charging stations 2110 comprises a coil 2115 and        one or more electrical interconnections and/or electrical        connectors 1115 to receive energy wirelessly from the charging        circuit 2400, and to transfer energy wired to the respective        rechargeable instrument 104.

In this embodiment 2106, it is not necessary that the mobile device 108comprises an energy transfer coil as the energy is transferred using thecoil 2125 comprised in the charging circuit 2400. However, it may beadvantageous to use a mobile device with an energy transfer coil, and totransfer energy at substantially the same time that energy istransferred by the energy transfer coil 2125 of the charging circuit2400.

Similarly, it is not necessary that the rechargeable instruments 104comprise an energy receiving coil as the energy is transferred using theenergy receiving coil 2115 and the interconnections and/or connectors1115 (also called galvanic contacts) comprised in the charging station2110.

Where required, the charging device 2400 may be configured and arrangedto control the charging in a predetermined and/or controlled manner.

FIG. 9 depicts schematically yet another embodiment of a chargingcircuit 1400 comprised in yet a further embodiment of a charging device1106.

The charging device 1106 is the same as that depicted in FIG. 10, exceptfor:

-   -   the charging circuit 1400 comprises further electrical        interconnections and/or electrical connectors 1115, configured        and arranged to connect to the mobile phone 108 when placed in        the holder 1120, and further configured and arranged to transfer        energy wired from the energy supply of the mobile phone 108 to        the charging circuit 1400; and    -   the charging circuit 1400 comprises further electrical        interconnections and/or electrical connectors 1115, configured        and arranged to connect to the two or more rechargeable        instruments 102 when placed in the charging stations 1110 to        transfer energy wired from the charging circuit 1400.

In this embodiment 1106, it is not necessary that the mobile device 108comprises an energy transfer coil as the energy is transferred using theinterconnections and/or connectors 1115 comprised in the chargingcircuit 1400. Similarly, it is not necessary that the rechargeableinstruments 104 comprise an energy receiving coil as the energy istransferred using the interconnections and/or connectors 1115 comprisedin the charging circuit 1400.

Where required, the charging device 1400 may be configured and arrangedto control the charging in a predetermined and/or controlled manner.

A further problem with rechargeable instruments 104, and in particular,personalized rechargeable instruments, is the desire by a user fordiscretion. A user or individual may wish to transport and charge theinstruments 104 without revealing their presence to others. Inparticular, when the rechargeable instruments 104 are configured for oneor more therapeutic, stimulation and/or medical uses, the user may notwish others to be aware that they have a condition which requirestreatment.

The mobile phone cover as disclosed herein may be modified to provideinconspicuous and unobtrusive storage and charging. FIG. 1 depicts amobile phone cover in perspective view, and FIG. 12 depicts a portion ofthe same mobile phone cover schematically after the mobile phone 108 hasbeen placed in the holder 120.

FIG. 12 shows the holder 120 portion of the mobile phone cover as viewedfrom directly above the screen size or the back size of the mobile phone108. Preferred is the mobile phone cover is configured and arranged sucha user may view at least a portion of the mobile phone 108 display whenthe mobile phone 108 is retained in the mobile phone cover—in otherwords, when the view of FIG. 12 is considered as viewed directly fromabove the screen side. This allows at least some functions of the mobilephone 108 to be used normally.

The mobile phone cover includes a retaining surface comprising the twoor more charging stations 110. As depicted in the example of FIG. 1 andFIG. 12, this is the upper surface of the portable charging device 106.

In general:

-   -   the holder 120 comprises one or more mobile phone 108 retainers,        configured and arranged to releasably receive and retain the        mobile phone 108 such that the visibility of at least a portion        of the mobile phone cover is restricted when the mobile phone        108 is retained in the holder 120; and    -   one or more rechargeable instrument 104 retainers, configured        and arranged to releasably receive and retain the one or more        rechargeable instruments 104 in a charging station 110, wherein        the one or more charging stations 110 are comprised in the        restricted visibility portion of the mobile phone cover such        that the visibility of the retained rechargeable instruments 104        is restricted when the mobile phone 108 is retained in the        holder 120.

In the example of FIG. 1 and FIG. 12, the holder 120 provides twoholding functions 120 a, 120 b:

holder 120 a=configured and arranged to releasably receive and retainthe mobile phone 108 (for example, by using one or more mechanicalretainers), and

holder 120 b=configured and arranged to be releasably retained by theretaining surface of the portable charging device 106 (for example, byusing one or more magnets).

As depicted, the mobile phone 108 is retained in the holder 120 a whenholder 120 b is released from the mobile phone cover.

Alternatively, the holder 120 may be integrated with the retaining(upper) surface of the portable charging device 106 to provide oneholding function. The mobile phone 108 is then released from the holder120 when it is released from the mobile phone cover.

When the mobile phone 108 is retained in the mobile phone cover,visibility of a portion of the upper surface of the charging device 106is restricted, and the charging stations 110 are comprised in theportion with restricted visibility. In other words, the mobile phone 108covers the accessible part of the two or more charging stations 110 whenit is retained in the mobile phone cover. The approximate locations ofthe charging stations 110 covered by the mobile phone 108 are depictedin FIG. 12.

Many different types of retainer configurations which may be used,allowing a higher or lower degree of release. For example, the holder120 may be configured and arranged to slide over the retention surfaceto reveal the charging stations 110. Additionally or alternatively, oneor more rotation points may be used. Additionally or alternatively, oneor more hinges may be used.

Optionally, different degrees of release may be provided, allowing oneor more charging stations 110 to be revealed.

Preferably, the visibility of substantially all outer surfaces of thetwo or more rechargeable instruments 104 is restricted when the mobilephone 108 is retained in the mobile phone cover by being retained in theholder 120.

This provides a very high degree of discretion as the rechargeableinstruments 104 are hidden, allowing the user to transport themcovertly.

The mobile phone cover providing charging and storage as depicted inFIG. 1, may be further configured and arranged to comprise any of theportable charging devices disclosed herein, such as the depictedembodiments 1106 in FIG. 9, 2106 in FIG. 10, and 3106 in FIG. 11. Therelative positions of the retained mobile phone 108 and retainedrechargeable instruments 104 may be configured and arranged depending onthe requirements of the charging circuits 400, 1400, 2400, 3400. Forexample, when implementing the example of FIG. 11, it may beadvantageous to minimise the distance between energy transfer coil 3125comprised in the mobile phone and the energy receiving coils 3115comprised in the two or more rechargeable instruments 104.

FIG. 13 depicts a portion of a further embodiment of a mobile phonecover schematically after the mobile phone 108 has been placed in aholder 120, 1120, 2120, 3120. FIG. 13 shows the holder 120, 1120, 2120,3120 portion of the mobile phone cover as viewed from directly above thescreen side or the back side of the mobile phone 108. The mobile phonecover includes a retaining surface comprising the two or more chargingstations 110, 1110, 2110, 3110. This is the upper surface of theportable charging device 106, 1106, 2106.3106.

It is the same as depicted in FIG. 12, except:

-   -   the portable charging device 106, 1106, 2106, 3106 further        comprises one or more drawers, allowing one or more charging        stations 110, 1110, 2110, 3110 to be revealed without releasing        the mobile phone 108. As depicted, a single drawer is used to        reveal and/or cover (conceal) four charging stations 110, 1110,        2110, 3110, but any suitable number of drawers may be used. It        may be advantageous to provide one drawer for each charging        station 110, 1110, 2110, 3110.

FIG. 14 depicts a portion of a further embodiment of a mobile phonecover schematically after the mobile phone 108 has been placed in aholder 120, 1120, 2120, 3120. FIG. 14 shows the mobile phone cover asviewed from directly above the screen side or the back side of themobile phone 108. The mobile phone cover comprises two main sections:

-   -   a holder 120, 1120, 2120, 3120 portion for retaining the mobile        phone 108, depicted on the right, and    -   the charging station 110, 1110, 2110, 3110 portion of the        portable charging device 106, 1106, 2106, 3106, depicted on the        left.

As depicted, the mobile phone cover is open. These sections areconnected using one or more hinges, and the mobile phone cover is closedby rotating the charging station section about the one or more hinges.

In this example, one or more charging stations 110, 1110, 2110, 3110 maybe at least partially visible when the mobile phone cover is open. Inthis example, the visibility of the retained rechargeable instruments104 is restricted when the mobile phone 108 is retained in the holder120, 1120, 2120, 3120 and the mobile phone cover is closed.

Optionally, the holder 120, 1120, 2120, 3120 may be further configuredand arranged to provide a second holding function, namely to receive andhold the mobile phone cover closed.

While the invention has been described in terms of several embodiments,it is contemplated that alternatives, modifications, permutations andequivalents thereof will become apparent to those skilled in the artupon reading the specification and upon study of the drawings. It mustbe understood that this description is given solely by way of exampleand not as limitation to the scope of protection, which is defined bythe appended claims.

For example, it may be advantageous for the mobile phone cover tofurther comprise one or more software, mechanical, electrical, opticalor acoustic elements to indicate to a user that one or more rechargeableinstruments 104 are retained in a charging station 110, 1110, 2110,3110. Additionally or alternatively, an empty charging station 110,1110, 2110, 3110 may also be similarly indicated. It may be advantageousfor the occupancy status of the charging stations to be indicated usinga software app, running on the mobile phone 108.

Additionally or alternatively, it may be advantageous for the mobilephone cover to further comprise one or more software, mechanical,electrical, optical or acoustic elements to indicate to a user thecharging states of one or more rechargeable instruments 104 retained ina charging station 110, 1110, 2110, 3110. Additionally or optionally,the discharge state and/or estimated usage time may also be similarlyindicated. It may be advantageous for the charge/discharge/usage statusof the rechargeable instruments 104 to be indicated using a softwareapp, running on the mobile phone 108.

Optionally, the charging stations may be further configured and arrangedto allow convenient cleaning by a user. This is particularlyadvantageous when the rechargeable instruments 104 are configured foruse, either directly or indirectly, in one or more therapeutic,stimulation and/or medical uses.

In a further example, a mobile phone cover may comprise:

-   -   a holder 120, 1120, 2120, 3120 for receiving and retaining a        mobile phone 108;    -   portable charging device 106, 1106, 2106, 3106 having two or        more charging stations 110, 1110, 2110, 3110 and an energy        supply, each charging station 110, 1110, 2110, 3110 being        configured and arranged for receiving and retaining a        rechargeable instrument 104, the rechargeable instrument 104        comprising an energy storage;

the portable charging device 106, 1106, 2106, 3106 being furtherconfigured and arranged:

-   -   to transfer energy, in use, from the energy supply of portable        charging device 106, 1106, 2106, 3106 to the two or more        charging stations 110, 1110, 2110, 3110; and    -   to transfer energy, in use, from the charging stations 110,        1110, 2110, 3110 to the energy storage of the rechargeable        instrument 104 placed in the respective charging station 110,        1110, 2110, 3110.

By providing an energy supply in the portable charging station, this mayfurther reduce the risk that the instruments 104 will not work properlyor be inoperable when the user requires it. The rechargeable instrument104 should not be construed as including one or more mobile phones 108.

Alternatively, the energy supply of the portable charging device 106,1106, 2106, 3106 may comprise one or more rechargeable batteries. Thismay allow the portable charging device 106, 1106, 2106, 3106 to becharged by an external charging device. In this example, the externalcharging device should not be construed, in this example, as includingthe mobile phone to be received and retained in the mobile phone cover.

In a further example, any of the mobile phone covers described hereinmay have a first and second outer surface, extended longitudinally andextended transversely, the thickness being determined by a perpendiculardistance between corresponding points on the first and second outersurfaces, the mobile phone cover having a maximum thickness of 2 cm orless, preferably 1 cm or less, more preferably 0.5 cm or less.

There is a growing need to transport smaller instruments, particularlywhen these are personalised. A thinner-dimensioned cover may mean thatthe user is more likely to use the cover regularly, preferably everyday. It may also further increase portability.

1. A medical system comprising N implantable medical devices (IMD), Mrechargeable external power transfer devices (EPTDs), wherein M≥N≥2, anda mobile device cover, the mobile device cover comprising: a holder forreceiving and retaining a mobile device, the mobile device comprising anenergy supply; and a portable charging device having two or morecharging stations, each charging station being configured and arrangedfor receiving and retaining the rechargeable EPTDs, each of the Mrechargeable EPTDs comprising an energy storage; wherein the portablecharging device is further configured and arranged: to transfer energyfrom the energy supply of the mobile device, when placed in the holder,to the two or more charging stations; and to transfer energy from thecharging stations to the energy storage of one or more of the Mrechargeable EPTDs when placed in the two or more charging stations;wherein each of the M rechargeable EPTDs is configured for wirelesslypowering one or more of the IMDs and comprises a memory configured forstoring at least N implantable device parameter sets, each of the atleast N implantable device parameter sets comprising a uniqueidentification code; wherein each of the M rechargeable EPTDs isconfigured to wirelessly transmit implantable device parameter setsstored in the memory; wherein each of the N IMDs comprises a unique IMDidentification code and is configured to wirelessly receive at least aone implantable device parameter set of the at least N implantabledevice parameter sets having the unique identification code matching theunique IMD identification code, and to deploy said one implantabledevice parameter set, whereby the IMD is enabled to providecorresponding electrical stimulation to tissue where the IMD isinserted.
 2. The medical system according to claim 1, wherein the IMDsare configured for cortical stimulation, deep brain stimulation, vagusnerve stimulation, carotid artery stimulation, carotid sinusstimulation, hypoglossal nerve stimulation, phrenic nerve stimulation,cerebral spinal cord stimulation, peripheral nerve stimulation, spinalcord stimulation, gastric stimulation, sacral nerve stimulation,pudendal nerve stimulation, sacral nerve stimulation, sacralneuromodulation, fibular nerve stimulation, or any combination thereof.3. The medical system according to claim 1, wherein the IMDs areconfigured for the stimulation of one or more nerves, one or moremuscles, one or more organs, spinal cord tissue, brain tissue, one ormore cortical surface regions, one or more sulci, or any combinationthereof.
 4. The medical system according to claim 1, wherein the IMDsare configured for neurostimulation for the treatment of headaches. 5.The medical system according to claim 4, wherein a first IMD of the IMDsis configured for Occipital Nerve Stimulation (ONS), and a further IMDof the IMDs is configured for Supra-Orbital Nerve Stimulation (SONS). 6.The medical system according to claim 5, wherein each rechargeable EPTDis configured to wirelessly transmit the implantable device parametersets stored in the memory to the first IMD and the further IMD.
 7. Themedical system according to claim 1, wherein the energy storage of atleast one of the one or more rechargeable EPTDs comprises one or morerechargeable batteries.
 8. The medical system according to claim 1,wherein the energy supply of the mobile device comprises one or morerechargeable batteries.
 9. The medical system according to claim 1,wherein the portable storage device comprises a further energy storage,comprising one or more rechargeable batteries.
 10. The medical systemaccording to according to claim 1, wherein at least one of the Mrechargeable EPTDs comprises a further energy supply; the portablecharging device being further configured and arranged: to transferenergy from the further energy supply of the at least one of the Mrechargeable EPTDs when placed in a first charging station of the two ormore charging stations, to one or more further charging station of thetwo or more charging stations; and to transfer energy from the one ormore further charging stations to the energy storage of a further one ofthe M rechargeable EPTDs placed in the respective further chargingstation.
 11. The medical system according to claim 1, wherein theportable charging device is further configured and arranged: to transferdata from the mobile device to one or more of the M rechargeable EPTDs;to receive data from the mobile device via the one or more of the Mrechargeable EPTDs; to transfer data from the one or more of the Mrechargeable EPTDs to the mobile device; to receive data from the one ormore of the M rechargeable EPTDs via the mobile device; to transfer datafrom a first of the M rechargeable EPTDs to a further of the Mrechargeable EPTDs; to receive data from the one or more of the Mrechargeable EPTDs via another of the M rechargeable EPTDs; or anycombination thereof.
 12. The medical system according to claim 11,wherein: the portable charging device is further configured to detectplacement of any of the M rechargeable EPTDs in any of the two or morecharging stations, and to transmit a first device parameter set storedin the memory of a detected one of the M rechargeable EPTDs placed inany of the two or more charging stations.
 13. The medical systemaccording to claim 11, wherein the portable charging device furthercomprises one or more memory components configured and arranged to storeand/or distribute one or more of the implantable device parameter sets.14. The medical system according to claim 13, wherein the portablecharging device is further configured: to receive a stored implantabledevice parameter set of the at least N implantable device parameterssets from a rechargeable EPTD of the M rechargeable EPTDs placed in oneof the two or more charging stations; and to store the receivedimplantable device parameter set in the memory of the portable chargingdevice.
 15. The medical system according to claim 14, wherein theportable charging device is further configured, after receipt of thestored implantable device parameter set, to transmit all deviceparameter sets stored in the memory of the portable charging device toall rechargeable EPTDs placed in any of the two or more chargingstations.
 16. The medical system according to claim 14, wherein: each ofthe N implantable device parameter sets further comprises a time stamp;and the portable charging device is further configured to update adevice parameter set stored in the memory of the portable storage devicewhen a version of the device parameter set stored in the memory of theportable storage device having a more recent time stamp is received. 17.The medical system according to claim 1, wherein the M rechargeableEPTDs comprise a first EPTD powering a first IMD of the N IMDs, whereinthe first IMD is configured to transmit the unique IMD identificationcode of the first IMD to the first EPTD; and wherein the first EPTD isconfigured to receive the unique IMD identification code from the firstIMD and to transmit to the first IMD the one implantable deviceparameter set having the unique identification code matching the uniqueIMD identification code received from the first IMD.
 18. The medicalsystem according to claim 1, wherein the first EPTD is configured tosend a power signal to the first IMD and is configured to exchange datawith the first IMD, wherein the first IMD is configured to operate in anot-connected mode and a connected mode, wherein the first IMD isconfigured in not-connected mode to transmit the unique IMDidentification code of the first IMD to the first EPTD and to changefrom not-connected mode to connected mode after receipt of the oneimplantable device parameter set having the unique identification codematching the unique IMD identification code of the first IMD.
 19. Themedical system according to claim 18, wherein the first IMD isconfigured to change from connected mode to not-connected mode afterreceipt of a command comprising a non-matching one of the unique IMDidentification codes which does not match the unique IMD identificationcode of the first IMD.
 20. The medical system according to claim 18,wherein the first IMD is configured in connected mode to intermittentlytransmit the unique IMD identification code of the first IMD.
 21. Themedical system according to claim 1, wherein the M rechargeable EPTDsare personalized devices, custom-made devices, devices for anindividual, patient-specific devices, patient-adaptable devices, or anycombination thereof.